scholarly journals Radial growth and characterization of juvenile and adult wood in plantation grown okoumé (Aucoumea klaineana Pierre) from Gabon

2007 ◽  
Vol 64 (8) ◽  
pp. 815-824 ◽  
Author(s):  
Marcel J. Medzegue ◽  
Stephane Grelier ◽  
Bertrand M’Batchi ◽  
Marcellin Nziengui ◽  
Alexia Stokes
Keyword(s):  
Radial Growth ◽  
Aucoumea Klaineana

Characterization of Rhizoctonia spp. isolates collected from Phaseolus vulgaris in Puerto Rico

1969 ◽  
Vol 84 (1-2) ◽  
pp. 79-86
Author(s):  
Rodrigo Echávez-Badel ◽  
Jorge E. Gómez-Galvé ◽  
Myrna Alameda-Lozada
Keyword(s):  
Puerto Rico ◽  
Phaseolus Vulgaris ◽  
Radial Growth ◽  
Reliable Method ◽  
Anastomosis Group ◽  
Soil Samples ◽  
Potato Dextrose Agar ◽  
Common Beans ◽  
Sexual Stage

Thirteen isolates collected from soil samples, infected seeds, hypocotyls, leaves and pods of common beans (Phaseolus vulgaris) grown in the northwestern, southern and western areas of Puerto Rico were identified as Rhizoctonia solani (Rs), and one as binucleate Rhizoctonia sp. (Rb). All isolates were characterized by the nuclear condition of the hyphae cell and the anastomosis technique. Seven Rs isolates (54%) were classified into anastomosis group AG 4, and six (46%) were assigned to AG 1. The microsclerotic Rb isolate did not anastomose with any of the AG testers. The AG 4 isolates produced only microsclerotia. Five AG 1 isolates (36%) were macrosclerotic, and one was microsclerotia The Rs isolates and the Rb isolate differed in mycelia radial growth after 48 h of incubation at 28° C on acidified potato dextrose agar. The sexual stage of the isolates was not observed throughout this research. Storing dried beet (Beta vulgaris L.) seeds colonized by R. solani for at least a year at 4° C in the dark seems to be a reliable method to ensure viability and virulence of the pathogen.

Growth and characterization of wurtzite GaP nanowires with control over axial and radial growth by use of HCl in-situ etching

2014 ◽  
Vol 386 ◽  
pp. 47-51 ◽  
Author(s):  
Alexander Berg ◽  
Sebastian Lehmann ◽  
Neimantas Vainorius ◽  
Anders Gustafsson ◽  
Mats-Erik Pistol ◽  
...  
Keyword(s):  
Radial Growth

Cultural, Morphological and Molecular Characterization of Fusarium Oxysporum f.sp. Ciceris Inciting Wilt of Chickpea

2019 ◽  
Author(s):  
K Venkataramanamma ◽  
B V Bhaskara Reddy ◽  
R Sarada Jayalakshmi ◽  
V Jayalakshmi ◽  
K V Hari Prasad ◽  
...  
Keyword(s):  
Fusarium Oxysporum ◽  
Radial Growth ◽  
Andhra Pradesh ◽  
Morphological Characters ◽  
Pathogenicity Test ◽  
Highly Pathogenic ◽  
Length Width ◽  
White Mycelium ◽  
Morphological And Molecular Characterization

Thirty two isolates of Fusarium oxysporum f.sp. ciceris (Foc) were collected from six districts of Andhra Pradesh (A.P) and three districts of Telangana. Based on wilting % in pathogenicity test, the isolates were grouped into three categories. All the isolates differed in cultural characters like mycelium colour, margin, texture, pigmentation and morphological characters like macro conidia, micro conidia length, width and chlamydospores diameter. There was no correlation between cultural and morphological characters of Foc isolates except three isolates (Foc-6, Foc-12 and Foc-17). These three isolates have white mycelium, cream colour pigmentation, slow radial growth and highly pathogenic (100% wilt incidence) in nature. Sporulation ability and radial growth of all isolates were also measured. All the isolates exhibited genetic variation in RAPD banding pattern and three major clusters (I, II and III) were found in the dendrogram. Maximum genetic similarity of 80.3% was observed between Foc-27 and Foc-28 isolates.

Synthesis Aligned ZnS Nanocone and its Photoluminescence

2011 ◽  
Vol 295-297 ◽  
pp. 610-613
Author(s):  
Jiang Feng Gong ◽  
Wei Hua Zhu ◽  
Kai Xiao Zhang ◽  
Ming Yi Liu ◽  
Hai Yan Xie
Keyword(s):  
Electron Microscopy ◽  
Radial Growth ◽  
Room Temperature ◽  
Thermal Evaporation ◽  
Synthesis And Characterization ◽  
The Novel ◽  
Room Temperature Photoluminescence ◽  
Transmission Electron ◽  
Scanning Electron

We report the synthesis and characterization of ZnS nanostructures, which were grown by thermal evaporation of the ZnS powder at high temperature using iron network as the collection substrate. Scanning electron microscopy investigations show that the products present taper-like morphologies. Transmission electron microscopy studies indicate ZnS nanostructures are well crystallized. The formation mechanism of the novel nanostructure is discussed on the basis of the experimental results; The nanostructure is formed due to a fast growth of ZnS nanowire along [0001] and the subsequent “epitaxial” radial growth of the ZnS nanocone along the six (01-10) surfaces around the nanowire. A strong room-temperature photoluminescence in ZnS nanostructures has been demonstrated.

scholarly journals Extraction and Characterization of Aucoumea klaineana Pierre (Okoume) Extractives

2019 ◽  
Vol 7 (6) ◽  
pp. 517-522 ◽  
Author(s):  
Engozogho Anris Starlin Peguy ◽  
Bikoro Bi Athomo Arsene ◽  
Vidal Marcia ◽  
Denaud Louis ◽  
Safou Tchiama Rodrigue ◽  
...  
Keyword(s):  
Aucoumea Klaineana

Maldi-ToF analysis and FTIR characterization of Aucoumea klaineana Pierre (Okoume) sapwood and heartwood condensed tannins from Gabon’s natural forest

2020 ◽  
Vol 54 (4) ◽  
pp. 907-928
Author(s):  
Starlin Peguy Engozogho Anris ◽  
Arsene Bikoro Bi Athomo ◽  
Rodrigue Safou Tchiama ◽  
Francisco José Santiago-Medina ◽  
Antonio Pizzi ◽  
...  
Keyword(s):  
Condensed Tannins ◽  
Natural Forest ◽  
Maldi Tof ◽  
Ftir Characterization ◽  
Aucoumea Klaineana

scholarly journals A dual-droplet approach for measuring the hygroscopicity of aqueous aerosol

2021 ◽  
Vol 14 (7) ◽  
pp. 5001-5013
Author(s):  
Jack M. Choczynski ◽  
Ravleen Kaur Kohli ◽  
Craig S. Sheldon ◽  
Chelsea L. Price ◽  
James F. Davies
Keyword(s):  
Radial Growth ◽  
Chemical Reactivity ◽  
Aerosol Particles ◽  
High Viscosity ◽  
Hygroscopic Growth ◽  
Electrodynamic Balance ◽  
Sample Droplet ◽  
Better Than

Abstract. Accurate characterization of the water activity and hygroscopicity of aqueous aerosol material allows us to predict the chemical and physical state of aerosol particles exposed to humid conditions in the environment. The hygroscopicity of aerosol determines the size, phase morphology, viscosity, chemical reactivity, and optical properties of constituent particles and directly impacts their ability to form clouds in the atmosphere. In this work, we describe measurements of hygroscopicity using a linear quadrupole electrodynamic balance (LQ-EDB). We levitate two droplets, one droplet that acts as a relative humidity (RH) probe and one sample droplet, and expose them to controlled environmental conditions. We describe the development of an RH measurement using probe droplets of aqueous NaCl or LiCl, allowing for precise in situ measurements of RH in the LQ-EDB chamber. We demonstrate that the RH may be determined with an accuracy of 0.5 % at 50 % RH and better than 0.1 % at 90 % RH using NaCl, and we show that LiCl is effective at characterizing the RH from ∼ 10 % RH up to ∼ 90 %. We simultaneously measure the response of sample droplets containing aqueous material (including ammonium sulfate, citric acid, 1,2,6-hexanetriol, and tetra-ethylene glycol) and report hygroscopic growth via their radial growth factors. We use established thermodynamic models to validate the accuracy of the RH probe and to compare with the measured hygroscopicity of the samples. This approach shows significant advantages over other methods for accurately characterizing the hygroscopicity of samples with a range of characteristics, such as high viscosity and vapor pressure.

scholarly journals Genetic Characterization of Mutations Related to Conidiophore Stalk Length Development in Aspergillus niger Laboratory Strain N402

2021 ◽  
Vol 12 ◽  
Author(s):  
Ebru Demirci ◽  
Mark Arentshorst ◽  
Baran Yilmaz ◽  
Aram Swinkels ◽  
Ian D. Reid ◽  
...  
Keyword(s):  
Aspergillus Niger ◽  
Radial Growth ◽  
Laboratory Strain ◽  
Industrial Biotechnology ◽  
Reference Laboratory ◽  
Nucleotide Polymorphisms ◽  
Single Nucleotide ◽  
Chromosome Iii ◽  
Stalk Length

Aspergillus niger is an important filamentous fungus in industrial biotechnology for the production of citric acid and enzymes. In the late 1980s, the A. niger N400/NRRL3 strain was selected for both fundamental and applied studies in relation to several processes including gluconic acid and protein production. To facilitate handling of A. niger, the N400 wild-type strain was UV mutagenized in two consecutive rounds to generate N401 and N402. N402 was used as a reference laboratory strain and exhibits the phenotypes with reduced conidiophore stalk length and reduced radial growth. The conidiophore stalk length and radial growth of A. niger strain N400 were determined and compared to N401 and N402. The length of N400 conidiophore stalks (2.52 ± 0.40 mm) was reduced in N401 and N402 to 0.66 ± 0.14 mm and 0.34 ± 0.06 mm, respectively. Whereas N400 reached a colony diameter of 6.7 ± 0.2 cm after 7 days, N401 and N402 displayed reduced radial growth phenotype (4.3 ± 0.1 and 4.1 ± 0.1, respectively). To identify the mutations (dubbed cspA and cspB) responsible for the phenotypes of N401 and N402, the genomes were sequenced and compared to the N400 genome sequence. A parasexual cross was performed between N400 and N402 derivatives to isolate segregants which allowed cosegregation analysis of single nucleotide polymorphisms and insertions and deletions among the segregants. The shorter conidiophore stalk and reduced radial growth in N401 (cspA) was found to be caused by a 9-kb deletion on chromosome III and was further narrowed down to a truncation of NRRL3_03857 which encodes a kinesin-like protein homologous to the A. nidulans UncA protein. The mutation responsible for the further shortening of conidiophore stalks in N402 (cspB) was found to be caused by a missense mutation on chromosome V in a hitherto unstudied C2H2 transcription factor encoded by the gene NRRL3_06646. The importance of these two genes in relation to conidiophore stalk length and radial growth was confirmed by single and double gene deletion studies. The mutations in the laboratory strain N402 should be taken into consideration when studying phenotypes in the N402 background.

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